ISL6269 Datasheet, PDF (6/14 Pages) Intersil Corporation – High-Performance Notebook PWM Controller with Audio-Frequency Clamp

ISL6269
Electrical Specifications
These specifications apply for T_A = -40°C to +100°C, unless otherwise stated. All typical specifications T_A = +25°C,
PVCC = 5V, VIN = 15V. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise
specified. Temperature limits established by characterization and are not production tested. (Continued)
PARAMETER
FCCM Leakage
PROTECTION
ISEN OCP Threshold
ISEN Short-Circuit Threshold
UVP Threshold
OVP Rising Threshold
OVP Falling Threshold
OTP Rising Threshold
OTP Hysteresis
SYMBOL
I_FCCML
I_FCCMH
FCCM = 0V
FCCM = 5.0V
TEST CONDITIONS
I_OC
I_SC
V_UV
V_OVR
V_OVF
T_OTR
T_OTHYS
ISEN sourcing, T_A = -10°C to +100°C
ISEN sourcing
ISEN sourcing
MIN TYP MAX UNIT
-
0.1 1.0 µA
-
2.0
-
µA
19
26
33
µA
17
26
33
µA
-
50
-
µA
81
84
87
%
113 116 119
%
100 103 106
%
-
150
-
°C
-
25
-
°C
Functional Pin Descriptions
VIN (Pin 1)
The VIN pin measures the converter input voltage which is a
required input to the R³ PWM modulator. The VIN pin is also
the input source for the integrated +5V LDO regulator.
Connect across the drain of the high-side MOSFET to the
GND pin.
VCC (Pin 2)
The VCC pin is the output of the integrated +5V LDO
regulator, which provides the bias voltage for the IC. The
VCC pin delivers regulated +5V whenever the EN pin is
pulled above V_ENTHR. For best performance the LDO
requires at least a 1µF MLCC decouple capacitor to the
GND pin.
FCCM (Pin 3)
The FCCM pin configures the controller to operate in forced-
continuous-conduction-mode (FCCM) or diode-emulation-
mode (DEM). DEM is disabled when the FCCM pin is pulled
above the rising threshold voltage V_FCCMTHR, conversely
DEM is enabled when the FCCM pin is pulled below the
falling threshold voltage V_FCCMTHF.
EN (Pin 4)
The EN pin is the on/off switch of the IC. When the EN pin is
pulled above the rising threshold voltage V_ENTHR, the VCC
5V LDO ramps and begins regulating. The soft-start
sequence begins after V_VCC is above the power-on reset
(POR) rising threshold voltage V_{VCC_THR}. When the EN pin
is pulled below the falling threshold voltage V_ENTHF, PWM
immediately stops and V_VCC decays below the POR falling
threshold voltage V_{VCC_THF}, at which time the IC turns off.
COMP (Pin 5)
The COMP pin is the output of the control-loop error
amplifier. Compensation components for the control-loop
connect across the COMP and FB pins.
FB (Pin 6)
The FB pin is the inverting input of the control-loop error
amplifier. The converter output voltage regulates to 600mV
from the FB pin to the GND pin. Program the desired output
voltage with a resistor network connected across the VO,
FB, and GND pins. Select the resistor values such that FB to
GND is 600mV when the converter output voltage is at the
programmed regulation value.
FSET (Pin 7)
The FSET pin programs the PWM switching frequency.
Program the desired PWM frequency with a resistor and a
capacitor connected across the FSET and GND pins.
VO (Pin 8)
The VO pin measures the converter output voltage and is
used exclusively as an input to the R³ PWM modulator.
Connect at the physical location where the best output
voltage regulation is desired.
ISEN (Pin 9)
The ISEN pin programs the threshold of the OCP
overcurrent fault protection. Program the desired OCP
threshold with a resistor connected across the ISEN and
PHASE pins. The OCP threshold is programmed to detect
the peak current of the output inductor. The peak current is
the sum of the DC and AC components of the inductor
current.
PGND (Pin 10)
The PGND pin conducts the turn-off transient current
through the LG gate driver. The PGND pin must be
connected to complete the pull-down circuit of the LG gate
driver. The PGND pin should be connected to the source of
the low-side MOSFET through a low impedance path,
preferably in parallel with the trace connecting the LG pin to
the gate of the low-side MOSFET. The adaptive shoot-
through protection circuit, measures the low-side MOSFET
gate-source voltage from the LG pin to the PGND pin.
6
FN9177.3
June 25, 2009